Optimization of a DoD Print Head Signal for the Ink-Jetting of Conductive Circuits

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Abstract:

The inkjet-printing principle is becoming more and more important for electronical applications. Printing conductive circuits is possible with colloidal inks so far, but stability of the printing process is not guaranteed at all times.

The piezo activation signal, meaning its shape, strength and duration influences the droplet formation process and printing stability enormously. The droplets' velocity and volume can vary from 1 to 6 m/s and 100 to 300 pL respectively for a 100 μm nozzle print head. Small droplets are desired for highest resolution, but they depend on the piezo activation signal u(t). Furthermore, the stability of the printing process is influenced by the energy provided to the droplet.

By means of a frequency response analysis of the print head, new shapes of u(t) are generated and tested practically. The influences of different piezo signals on the printing process are shown by measuring volume and velocity of the generated stable droplets. The article shows a method of optimizing a piezo activating signal to gain accuracy and resolution for inkjet printed electrical circuits.

Document Type: Research Article

Publication date: January 1, 2008

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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